一种自清洁自冷却纸
Self-cleaning and self-cooling paper
摘要：
被动式日间辐射冷却（PDRC）技术用于通过地球大气层窗口将太阳光反射和热辐射同时向寒冷的太空冷却物体。然而，对于实际应用，目前的PDRC材料正面临着前所未有的挑战，如复杂和昂贵的制造方法和表面污染引起的性能下降。在这里，我们开发了一种可扩展的纸基材料，具有优异的自清洁和自冷却能力，通过空气喷涂乙醇聚四氟乙烯（PTFE）微粒悬浮液嵌入纸的微孔内。形成的超疏水PTFE涂层不仅可以保护纸张免受现实生活中的水润湿和灰尘污染，而且还可以通过太阳光后向散射增强其太阳反射率。当用PTFE颗粒增强时，纸纤维有效地反射太阳光并通过大气窗强烈辐射热，导致在834 W/m $^2$和671 W/m $^2$的直接太阳辐照下分别为5 $^{\circ}$ C的亚环境冷却性能和104 W/m $^2$的辐射冷却功率。冷却纸的自清洁表面延长了其使用寿命，并保持其良好的冷却性能，适用于户外应用。此外，染色纸的实验研究广泛的工程应用。它们可以吸收适当的可见光波长以显示特定的颜色，并有效地反射近红外线以减少太阳能加热，从而以具有成本效益、可扩展和节能的方式同步实现有效的辐射冷却和美学多样性。
英文摘要：
The technique of passive daytime radiative cooling (PDRC) is used to cool an object down by simultaneously reflecting sunlight and thermally radiating heat to the cold outer space through the Earth's atmospheric window. However, for practical applications, current PDRC materials are facing unprecedented challenges such as complicated and expensive fabrication approaches and performance degradation arising from surface contamination. Here, we develop a scalable paper-based material with excellent self-cleaning and self-cooling capabilities, through air-spraying ethanolic polytetrafluoroethylene (PTFE) microparticles suspensions embedded within the micropores of the paper. The formed superhydrophobic PTFE coating not only protects the paper from water wetting and dust contamination for real-life applications but also reinforces its solar reflectance by sunlight backscattering. The paper fibers, when enhanced with PTFE particles, efficiently reflect sunlight and strongly radiate heat through the atmospheric window, resulting in a sub-ambient cooling performance of 5$^{\circ}$C and radiative cooling power of 104 W/m$^2$ under direct solar irradiance of 834 W/m$^2$ and 671 W/m$^2$, respectively. The self-cleaning surface of the cooling paper extends its lifespan and keep its good cooling performance for outdoor applications. Additionally, dyed papers are experimentally studied for broad engineering applications. They can absorb appropriate visible wavelengths to display specific colors and effectively reflect near-infrared lights to reduce solar heating, which synchronously achieves effective radiative cooling and aesthetic varieties in a cost-effective, scalable, and energy-efficient way.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
